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8. Stock-Based Compensation (Details 1) - Options - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Dividend-yield	0.00%	0.00%
Risk-free interest rate	2.59%	2.52%
Expected volatility	88.52%	81.46%
Expected life (years)	6 years 4 months 28 days	6 years 5 months 23 days
Market value per share on grant date	$ 0.70	$ 0.70
Weighted average fair value per share of common stock	$ 0.53	$ 0.50

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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